迴歸分析(Regression analysis)主要是探討解釋變數與反應變數間的各種關係。但是在建構回歸分析時，有時會發現所得到的資料是由真實解釋變數和測量誤差所結合而成的觀測值，像這種具測量誤差的迴歸模式，我們稱為測量誤差模式〈measurement error model〉。 在探討測量誤差模式的參數估計問題時，會遇到的參數不可辨認的問題。因此文獻中探討參數估計問題時，是在額外假設條件下估計參數，若不要額外假設條件而要去除參數不可辨認的模型，可利用過量參數法來估計參數，這時需假設觀測到具測量誤差的解釋變數的分佈要為不對稱分佈。 本文要探討的是在不限制有測量誤差的解釋變數的分佈下估計參數的方法，首先探討Y跟e^(t*w)的共變異數關係，可以得到如下式子 G(t)=β*M_{W_i^*}^''(t)-β*(M_{δ_i}^''(t)/M_{δ_i}(t))*M_{W_i^*}(t) 根據這一式子，我們分別假設特定條件，例如：已知δ的分配且變異數已知、不知道δ的分配但是利用泰勒展開式來求解等等，從中找到參數β的理論解，並且利用動差法來求得理論解所對應的估計量族群，隨後利用電腦模擬來討論所得到的估計量族群的效果，並說明是否有一個最佳的估計方法，如果沒有，那是否會有在特定條件下的最佳估計方法。 Regression analysis mainly discusses the relation between the explains variable and reaction variable. But sometimes we find the data that is combined by true explained variable and measurement error when we constructed back to regression analysis. We call this kind of regression model as measurement error model. When we discuss the problem of parameter estimate of measurement error model, the problem of parameter not recognizable will be meeting for us. Therefore literatures treats of the problem in the additional assumption condition. If don''t suppose the additional assumption condition but we also want to dispose of the parameter not recognizable, we can estimate the parameter by overparameterization method, at this we need supposed the explains variable of having measurement error that must want to dissymmetrical density. In this text, we discuss the method of estimating parameter that the density of explains variable of having measurement error is not abridge, we inquire the covariance of y and e^(t*w) and we can get a formula as follows G(t)=β*M_{W_i^*}^''(t)-β*(M_{δ_i}^''(t)/M_{δ_i}(t))*M_{W_i^*}(t) Now according to this formula, we suppose some particular conditions. For example: first we know the density of δ and the variance is known, second we are unknown the density of δ. Using Taylor expansion can fine the estimation. Then we want to fined the theoretical solution of parameter β.By using moment method, we can obtain the population of estimator. With the computer simulation, we could discuss the effect of population of estimation, and explain whether have a best estimate method. If it couldn’t, it would have the best estimation under the particular condition?
